One SIM.
Every UK network.
No blind spots.
Zentari IoT SIMs roam freely across Vodafone, O2, EE and Three — always connecting to the strongest available signal at your deployment site, with no carrier steering.
Networks we roam across
The Problem
Traditional IoT SIMs have a fundamental weakness.
When a single-network SIM's carrier has an outage, suffers coverage gaps at your site, or throttles data — your device goes offline. There's no fallback, and the problem often isn't visible until something stops working.
Network outages mean device outages
Every UK carrier suffers periodic outages. On a single-network SIM, any carrier incident takes all your devices on that network offline simultaneously — with no automatic recovery.
Coverage gaps where your devices live
Rural sites, industrial buildings, and underground locations often have strong signal from one or two carriers but not all four. A single-network SIM installed at the wrong site simply won't connect.
Stale data and invisible overages
Traditional carrier portals refresh usage once a day — or less. By the time you see a data spike, the overage charges have already accumulated and the billing period has closed.
Your SIM always picks the best signal. Automatically.
Zentari SIMs are genuinely unsteered — there's no commercial agreement steering your device toward a preferred network. The SIM evaluates all four UK networks at every moment and connects to whichever delivers the strongest signal.
Continuous network scan
The SIM continuously monitors signal strength and quality across all four UK networks — Vodafone, O2, EE, and Three — in real time.
Strongest signal wins — always
Connection is made to whichever network delivers the best signal at the device's physical location. No steering, no preferred carrier, no commercial bias.
Seamless handover on degradation
If signal drops or the connected network suffers an outage, the SIM automatically switches to the next strongest available network — no intervention required.
Technical Specification
Everything your hardware needs. Nothing it doesn't.
From low-bandwidth sensors to high-throughput video uplinks — Zentari IoT SIMs adapt to your device and deployment requirements.
Connectivity
Data & Billing
Hardware & Security
Need a fixed IP address?
Static IP addresses are available for remote device access, CCTV streaming, SCADA integration, and VPN tunnels. Contact us to discuss your specific requirements and we'll configure your SIMs accordingly.
The Axis Layer
Every Zentari SIM comes with the full Axis platform underneath.
Connectivity is just the start. Every SIM you buy includes full access to the Axis control platform — real-time management, automated protection, and programmatic control, at no extra cost.
Axis Watchdog
Automated barring rules that fire before overage is generated. Set once at device, group, or pool level — Watchdog runs 24/7 without intervention.
Learn moreLive Usage Data
usage polling every 30 minutes gives you a near real-time view of every SIM in your estate. No more 24-hour-old data when you need to diagnose a spike.
Learn moreREST API
Activate SIMs, suspend devices, poll usage data, and configure Watchdog rules programmatically. Everything the portal does — your code can do too.
Learn moreWhere We're Deployed
IoT connectivity for every sector.
From warehouse floors to city streets — Zentari IoT SIMs are running in the UK and EU's most demanding environments.
Ready to take control of your IoT connectivity?
Join businesses across the UK who have replaced unpredictable carrier bills with a single, transparent, fully managed connectivity platform.
Get in Touch Today